Design, Synthesis, and Pesticidal Activities of Pyrimidin-4-amine Derivatives Bearing a 5-(Trifluoromethyl)-1,2,4-oxadiazole Moiety

被引:74
作者
Liu, Xing-Hai [1 ]
Wen, Yong-Hui [1 ,2 ]
Cheng, Long [1 ,2 ]
Xu, Tian-Ming [2 ]
Wu, Ning-Jie [2 ]
机构
[1] Zhejiang Univ Technol, Coll Chem Engn, Hangzhou 310014, Peoples R China
[2] Zhejiang Res Inst Chem Ind, Zhejiang Base Natl Southern Pesticide Res Ctr, Hangzhou 310023, Peoples R China
关键词
pyrimidin-4-amine derivatives; synthesis; fungicidal; insecticidal; SAR;
D O I
10.1021/acs.jafc.1c00236
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
It is important to discover new pesticides with new modes of action because of the increasing evolution of pesticide resistance. In this study, a series of novel pyrimidin-4-amine derivatives containing a 5-(trifluoromethyl)-1,2,4-oxadiazole moiety were designed and synthesized. Their structures were confirmed by H-1 NMR, C-13 NMR, and HRMS. Bioassays indicated that the 29 compounds synthesized possessed excellent insecticidal activity against Mythimna separata, Aphis medicagini, and Tetranychus cinnabarinus and fungicidal activity against Pseudoperonospora cubensis. Among these pyrimidin-4-amine compounds, 5-chloro-N-(2-fluoro-4-(5-(trifluoromethyl)-1,2,4-oxadiazol-3-yl)benzyl)-6-(1-fluoroethyl)pyrimidin-4-amine (U7) and 5-bromo-N-(2-fluoro-4-(5-(trifluoromethyl)-1,2,4-oxadiazol-3-yl)benzyl)-6-(1-fluoroethyl) pyrimidin-4-amine(U8) had broad-spectrum insecticidal and fungicidal activity. The LC50 values were 3.57 +/- 0.42, 4.22 +/- 0.47, and 3.14 +/- 0.73 mg/L for U7, U8, and flufenerim against M. separata, respectively. The EC50, values were 24.94 +/- 2.13, 30.79 +/- 2.21, and 3.18 +/- 0.21 mg/L for U7, U8, and azoxystrobin against P. cubensis, respectively. The AChE enzymatic activity testing revealed that the enzyme activities of compounds U7, U8, and flufenerim are 0.215, 0.184, and 0.184 U/mg prot, respectively. The molecular docking results of compounds U7, U8, and flufenerim with the AChE model demonstrated the opposite docking mode between compound U7 or U8 and positive control flufenerim in the active site of AChE. The structure-activity relationships are also discussed. This work provided excellent pesticide for further optimization. Density functional theory analysis can potentially be used to design more active compounds.
引用
收藏
页码:6968 / 6980
页数:13
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